[Bug libstdc++/57997] Segmentation fault after returning valarray expression from an auto function

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57997

--- Comment #9 from Marc Glisse <glisse at gcc dot gnu.org> ---
I'd rather work on improving the warnings so we can tell the user how bad his
code is, but in case, we had a similar request in GMP, a code that was inspired
by libstdc++ valarray:

https://gmplib.org/list-archives/gmp-bugs/2014-January/003315.html

and the discussion may contain hints relevant to the valarray case.